Prof. TSANG Hon Ki was elected Fellow of the Optical Society (OSA) for "contributions to nonlinear silicon photonics, sub-wavelength silicon waveguide gratings, and hybrid integration of graphene on silicon waveguides."

According to OSA, "the number of Fellows is limited by the Society's bylaws to be no more than 10 percent of the total OSA Membership and the number elected each year is limited to approximately 0.5 percent of the current membership total."

He entered the field of silicon photonics 17 years ago and pioneered the early study of nonlinear optical properties of silicon waveguides, for which he was recognised by the CUHK Vice Chancellor's Research Excellence Award in 2007.  His recent research in silicon photonics has advanced the technology of subwavelength gratings in silicon photonics and the hybrid integration of graphene on silicon waveguides.  He also received the Award of Outstanding Fellow of the Faculty of Engineering in 2017.